Add pulse animation for the thumbnail

[srimko]

It is a tried to figure it out how to inject CSS ans animation to an element. If you think it's a good idea I can further

[bdebon]

It's excellent. I had the idea to make something like, like injecting CSS to the current tab. I did not know exactly how to do it and did not have time to investigate. I don't see bad aspect with this. The only thing is to make the pulse only once and take car that if you change your thumbnail providing a new one, you must remove the last style and put it again to play the animation again once. You see what I mean?